Krzys, the newer screens are easily changed into the older body with some exceptions. The older 500 C models will require the screen be fitted and calibrated to make sure it focuses at the same plane as the lens. The 500 CM models on up are good to go with ANY of the alternate Hasselblad screens. I find the newer Acute matte screens superb compared to the older screens, and have the grid squared, microprism, and split circle versions on both my 500 c/m and 201F bodies and they make focusing a breeze even in lower light.